Stupid me. The expression "nacre" was not intended as the gist of the issue.
I realize that it was an error in terminology that only occurred once in the
posting.  I merely wanted to know if this type of encapsulation of a foreign
attachment was common and how it might occur.  However, thanks for keeping
me honest and educating me on the term "inductura" of which I was unaware.
That's an amateur for you.

Paul Kanner


----- Original Message -----
From: "Andrew Grebneff" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 23, 2002 12:21 AM
Subject: Re: Cypraea spadicea... nacre


> >In the strict technical sense, nacre-covered barnacles could only
> >occur in Gaza or similar forms, as nacre designates mother-of-pearl.
>
> Correctly speaking the smooth internal glaze produced by gastropods,
> which may in some taxa eg Cypraea extend over part or all of the
> external surface is called inductura.